<?php
/***************************************************************************
 *                               functions.php
 *                            -------------------
 *   begin                : Saturday, Feb 13, 2001
 *   copyright            : (C) 2001 The phpBB Group (phpbb.com)
 *   copyright            : (c) 2009 The phpCB Group (comboa.com)
 *
 *   $Id: functions.php 8377 2008-02-10 12:52:05Z acydburn $
 *
 *
 ***************************************************************************/

/***************************************************************************
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *
 ***************************************************************************/

/**
* set_var
*
* Set variable, used by {@link request_var the request_var function}
*
* @access private
*/
function set_var(&$result, $var, $type, $multibyte = false)
{
	settype($var, $type);
	$result = $var;

	if ($type == 'string')
	{
		$result = trim(htmlspecialchars(str_replace(array("\r\n", "\r", "\0"), array("\n", "\n", ''), $result), ENT_COMPAT, 'UTF-8'));

		if (!empty($result))
		{
			// Make sure multibyte characters are wellformed
			if ($multibyte)
			{
				if (!preg_match('/^./u', $result))
				{
					$result = '';
				}
			}
			else
			{
				// no multibyte, allow only ASCII (0-127)
				$result = preg_replace('/[\x80-\xFF]/', '?', $result);
			}
		}

		$result = (STRIP) ? stripslashes($result) : $result;
	}
}

/**
* request_var
*
* Used to get passed variable
*/
function request_var($var_name, $default, $multibyte = false, $cookie = false)
{
	if (!$cookie && isset($_COOKIE[$var_name]))
	{
		if (!isset($_GET[$var_name]) && !isset($_POST[$var_name]))
		{
			return (is_array($default)) ? array() : $default;
		}
		$_REQUEST[$var_name] = isset($_POST[$var_name]) ? $_POST[$var_name] : $_GET[$var_name];
	}

	if (!isset($_REQUEST[$var_name]) || (is_array($_REQUEST[$var_name]) && !is_array($default)) || (is_array($default) && !is_array($_REQUEST[$var_name])))
	{
		return (is_array($default)) ? array() : $default;
	}

	$var = $_REQUEST[$var_name];
	if (!is_array($default))
	{
		$type = gettype($default);
	}
	else
	{
		list($key_type, $type) = each($default);
		$type = gettype($type);
		$key_type = gettype($key_type);
		if ($type == 'array')
		{
			reset($default);
			$default = current($default);
			list($sub_key_type, $sub_type) = each($default);
			$sub_type = gettype($sub_type);
			$sub_type = ($sub_type == 'array') ? 'NULL' : $sub_type;
			$sub_key_type = gettype($sub_key_type);
		}
	}

	if (is_array($var))
	{
		$_var = $var;
		$var = array();

		foreach ($_var as $k => $v)
		{
			set_var($k, $k, $key_type);
			if ($type == 'array' && is_array($v))
			{
				foreach ($v as $_k => $_v)
				{
					if (is_array($_v))
					{
						$_v = null;
					}
					set_var($_k, $_k, $sub_key_type);
					set_var($var[$k][$_k], $_v, $sub_type, $multibyte);
				}
			}
			else
			{
				if ($type == 'array' || is_array($v))
				{
					$v = null;
				}
				set_var($var[$k], $v, $type, $multibyte);
			}
		}
	}
	else
	{
		set_var($var, $var, $type, $multibyte);
	}

	return $var;
}

function get_db_stat($mode)
{
	global $db;

	switch( $mode )
	{
		case 'usercount':
			$sql = "SELECT COUNT(user_id) AS total
				FROM " . USERS_TABLE . "
				WHERE user_id <> " . ANONYMOUS;
			break;

		case 'newestuser':
			$sql = "SELECT user_id, username
				FROM " . USERS_TABLE . "
				WHERE user_id <> " . ANONYMOUS . "
				ORDER BY user_id DESC
				LIMIT 1";
			break;

		case 'postcount':
		case 'topiccount':
			$sql = "SELECT SUM(forum_topics) AS topic_total, SUM(forum_posts) AS post_total
				FROM " . FORUMS_TABLE;
			break;
	}

	if ( !($result = $db->sql_query($sql)) )
	{
		return false;
	}

	$row = $db->sql_fetchrow($result);

	switch ( $mode )
	{
		case 'usercount':
			return $row['total'];
			break;
		case 'newestuser':
			return $row;
			break;
		case 'postcount':
			return $row['post_total'];
			break;
		case 'topiccount':
			return $row['topic_total'];
			break;
	}

	return false;
}

// added at phpBB 2.0.11 to properly format the username
function clean_username($username)
{
	$username = substr(htmlspecialchars(str_replace("\'", "'", trim($username))), 0, 25);
	$username = phpbb_rtrim($username, "\\");
	$username = str_replace("'", "\'", $username);

	return $username;
}

/**
* This function is a wrapper for ltrim, as charlist is only supported in php >= 4.1.0
* Added in phpBB 2.0.18
*/
function phpbb_ltrim($str, $charlist = false)
{
	if ($charlist === false)
	{
		return ltrim($str);
	}
	
	$php_version = explode('.', PHP_VERSION);

	// php version < 4.1.0
	if ((int) $php_version[0] < 4 || ((int) $php_version[0] == 4 && (int) $php_version[1] < 1))
	{
		while ($str{0} == $charlist)
		{
			$str = substr($str, 1);
		}
	}
	else
	{
		$str = ltrim($str, $charlist);
	}

	return $str;
}

// added at phpBB 2.0.12 to fix a bug in PHP 4.3.10 (only supporting charlist in php >= 4.1.0)
function phpbb_rtrim($str, $charlist = false)
{
	if ($charlist === false)
	{
		return rtrim($str);
	}
	
	$php_version = explode('.', PHP_VERSION);

	// php version < 4.1.0
	if ((int) $php_version[0] < 4 || ((int) $php_version[0] == 4 && (int) $php_version[1] < 1))
	{
		while ($str{strlen($str)-1} == $charlist)
		{
			$str = substr($str, 0, strlen($str)-1);
		}
	}
	else
	{
		$str = rtrim($str, $charlist);
	}

	return $str;
}

/**
* Our own generator of random values
* This uses a constantly changing value as the base for generating the values
* The board wide setting is updated once per page if this code is called
* With thanks to Anthrax101 for the inspiration on this one
* Added in phpBB 2.0.20
*/
function dss_rand()
{
	global $db, $board_config, $dss_seeded;

	$val = $board_config['rand_seed'] . microtime();
	$val = md5($val);
	$board_config['rand_seed'] = md5($board_config['rand_seed'] . $val . 'a');
   
	if($dss_seeded !== true)
	{
		$sql = "UPDATE " . CONFIG_TABLE . " SET
			config_value = '" . $board_config['rand_seed'] . "'
			WHERE config_name = 'rand_seed'";
		
		if( !$db->sql_query($sql) )
		{
			message_die(GENERAL_ERROR, "Unable to reseed PRNG", "", __LINE__, __FILE__, $sql);
		}

		$dss_seeded = true;
	}

	return substr($val, 4, 16);
}
//
// Get Userdata, $user can be username or user_id. If force_str is true, the username will be forced.
//
function get_userdata($user, $force_str = false)
{
	global $db;

	if (!is_numeric($user) || $force_str)
	{
		$user = clean_username($user);
	}
	else
	{
		$user = intval($user);
	}

	$sql = "SELECT *
		FROM " . USERS_TABLE . " 
		WHERE ";
	$sql .= ( ( is_integer($user) ) ? "user_id = $user" : "username = '" .  str_replace("\'", "''", $user) . "'" ) . " AND user_id <> " . ANONYMOUS;
	if ( !($result = $db->sql_query($sql)) )
	{
		message_die(GENERAL_ERROR, 'Tried obtaining data for a non-existent user', '', __LINE__, __FILE__, $sql);
	}

	return ( $row = $db->sql_fetchrow($result) ) ? $row : false;
}

function make_jumpbox($action, $match_forum_id = 0)
{
	global $template, $userdata, $lang, $db, $nav_links, $SID;

//	$is_auth = auth(AUTH_VIEW, AUTH_LIST_ALL, $userdata);

	$sql = "SELECT c.cat_id, c.cat_title, c.cat_order
		FROM " . CATEGORIES_TABLE . " c, " . FORUMS_TABLE . " f
		WHERE f.cat_id = c.cat_id
		GROUP BY c.cat_id, c.cat_title, c.cat_order
		ORDER BY c.cat_order";
	if ( !($result = $db->sql_query($sql)) )
	{
		message_die(GENERAL_ERROR, "Couldn't obtain category list.", "", __LINE__, __FILE__, $sql);
	}
	
	$category_rows = array();
	while ( $row = $db->sql_fetchrow($result) )
	{
		$category_rows[] = $row;
	}

	if ( $total_categories = count($category_rows) )
	{
		$sql = "SELECT *
			FROM " . FORUMS_TABLE . "
			ORDER BY cat_id, forum_order";
		if ( !($result = $db->sql_query($sql)) )
		{
			message_die(GENERAL_ERROR, 'Could not obtain forums information', '', __LINE__, __FILE__, $sql);
		}

		$boxstring = '<select name="' . POST_FORUM_URL . '" onchange="if(this.options[this.selectedIndex].value != -1){ forms[\'jumpbox\'].submit() }"><option value="-1">' . $lang['Select_forum'] . '</option>';

		$forum_rows = array();
		while ( $row = $db->sql_fetchrow($result) )
		{
			$forum_rows[] = $row;
		}

		if ( $total_forums = count($forum_rows) )
		{
			for($i = 0; $i < $total_categories; $i++)
			{
				$boxstring_forums = '';
				for($j = 0; $j < $total_forums; $j++)
				{
					if ( $forum_rows[$j]['cat_id'] == $category_rows[$i]['cat_id'] && $forum_rows[$j]['auth_view'] <= AUTH_REG )
					{

//					if ( $forum_rows[$j]['cat_id'] == $category_rows[$i]['cat_id'] && $is_auth[$forum_rows[$j]['forum_id']]['auth_view'] )
//					{
						$selected = ( $forum_rows[$j]['forum_id'] == $match_forum_id ) ? 'selected="selected"' : '';
						$boxstring_forums .=  '<option value="' . $forum_rows[$j]['forum_id'] . '"' . $selected . '>' . $forum_rows[$j]['forum_name'] . '</option>';

						//
						// Add an array to $nav_links for the Mozilla navigation bar.
						// 'chapter' and 'forum' can create multiple items, therefore we are using a nested array.
						//
						$nav_links['chapter forum'][$forum_rows[$j]['forum_id']] = array (
							'url' => append_sid("viewforum.php?" . POST_FORUM_URL . "=" . $forum_rows[$j]['forum_id']),
							'title' => $forum_rows[$j]['forum_name']
						);
								
					}
				}

				if ( $boxstring_forums != '' )
				{
					$boxstring .= '<option value="-1">&nbsp;</option>';
					$boxstring .= '<option value="-1">' . $category_rows[$i]['cat_title'] . '</option>';
					$boxstring .= '<option value="-1">----------------</option>';
					$boxstring .= $boxstring_forums;
				}
			}
		}

		$boxstring .= '</select>';
	}
	else
	{
		$boxstring .= '<select name="' . POST_FORUM_URL . '" onchange="if(this.options[this.selectedIndex].value != -1){ forms[\'jumpbox\'].submit() }"></select>';
	}

	// Let the jumpbox work again in sites having additional session id checks.
//	if ( !empty($SID) )
//	{
		$boxstring .= '<input type="hidden" name="sid" value="' . $userdata['session_id'] . '" />';
//	}

	$template->set_filenames(array(
		'jumpbox' => 'jumpbox.html')
	);
	$template->assign_vars(array(
		'L_GO' => $lang['Go'],
		'L_JUMP_TO' => $lang['Jump_to'],
		'L_SELECT_FORUM' => $lang['Select_forum'],

		'S_JUMPBOX_SELECT' => $boxstring,
		'S_JUMPBOX_ACTION' => append_sid($action))
	);
	$template->assign_var_from_handle('JUMPBOX', 'jumpbox');

	return;
}

//
// Initialise user settings on page load
function init_userprefs($userdata)
{
	global $board_config, $theme, $images;
	global $template, $lang, $comboa_root, $db;
	global $nav_links;

	if ( $userdata['user_id'] != ANONYMOUS )
	{
		if ( !empty($userdata['user_lang']))
		{
			$default_lang = phpbb_ltrim(basename(phpbb_rtrim($userdata['user_lang'])), "'");
		}

		if ( !empty($userdata['user_dateformat']) )
		{
			$board_config['default_dateformat'] = $userdata['user_dateformat'];
		}

		if ( isset($userdata['user_timezone']) )
		{
			$board_config['board_timezone'] = $userdata['user_timezone'];
		}
	}
	else
	{
		$default_lang = phpbb_ltrim(basename(phpbb_rtrim($board_config['default_lang'])), "'");
	}

	if ( !file_exists(@site_realpath($comboa_root . 'language/lang_' . $default_lang . '/lang_main.php')) )
	{
		if ( $userdata['user_id'] != ANONYMOUS )
		{
			// For logged in users, try the board default language next
			$default_lang = phpbb_ltrim(basename(phpbb_rtrim($board_config['default_lang'])), "'");
		}
		else
		{
			// For guests it means the default language is not present, try english
			// This is a long shot since it means serious errors in the setup to reach here,
			// but english is part of a new install so it's worth us trying
			$default_lang = 'english';
		}

		if ( !file_exists(@site_realpath($comboa_root . 'language/lang_' . $default_lang . '/lang_main.php')) )
		{
			message_die(CRITICAL_ERROR, 'Could not locate valid language pack');
		}
	}

	// If we've had to change the value in any way then let's write it back to the database
	// before we go any further since it means there is something wrong with it
	if ( $userdata['user_id'] != ANONYMOUS && $userdata['user_lang'] !== $default_lang )
	{
		$sql = 'UPDATE ' . USERS_TABLE . "
			SET user_lang = '" . $default_lang . "'
			WHERE user_lang = '" . $userdata['user_lang'] . "'";

		if ( !($result = $db->sql_query($sql)) )
		{
			message_die(CRITICAL_ERROR, 'Could not update user language info');
		}

		$userdata['user_lang'] = $default_lang;
	}
	elseif ( $userdata['user_id'] == ANONYMOUS && $board_config['default_lang'] !== $default_lang )
	{
		$sql = 'UPDATE ' . CONFIG_TABLE . "
			SET config_value = '" . $default_lang . "'
			WHERE config_name = 'default_lang'";

		if ( !($result = $db->sql_query($sql)) )
		{
			message_die(CRITICAL_ERROR, 'Could not update user language info');
		}
	}

	$board_config['default_lang'] = $default_lang;

	include($comboa_root . 'language/lang_' . $board_config['default_lang'] . '/lang_main.php');

	if( function_exists('mb_internal_encoding') )
	{
		mb_internal_encoding($lang['ENCODING']);
	}

	if ( defined('IN_ADMIN') )
	{
		if( !file_exists(@site_realpath($comboa_root . 'language/lang_' . $board_config['default_lang'] . '/lang_admin.php')) )
		{
			$board_config['default_lang'] = 'english';
		}

		include($comboa_root . 'language/lang_' . $board_config['default_lang'] . '/lang_admin.php');
	}

	//
	// Set up style
	//
	if ( !$board_config['override_user_style'] )
	{
		if ( $userdata['user_id'] != ANONYMOUS && $userdata['user_style'] > 0 )
		{
			if ( $theme = setup_style($userdata['user_style']) )
			{
				return;
			}
		}
	}

	$theme = setup_style($board_config['default_style']);

	//
	// Mozilla navigation bar
	// Default items that should be valid on all pages.
	// Defined here to correctly assign the Language Variables
	// and be able to change the variables within code.
	//
	$nav_links['top'] = array ( 
		'url' => append_sid($comboa_root . 'index.php'),
		'title' => sprintf($lang['Forum_Index'], $board_config['sitename'])
	);
	$nav_links['search'] = array ( 
		'url' => append_sid($comboa_root . 'search.php'),
		'title' => $lang['Search']
	);
	$nav_links['help'] = array ( 
		'url' => append_sid($comboa_root . 'faq.php'),
		'title' => $lang['FAQ']
	);
	$nav_links['author'] = array ( 
		'url' => append_sid($comboa_root . 'memberlist.php'),
		'title' => $lang['Memberlist']
	);

	return;
}

function setup_style($style)
{
	global $db, $board_config, $template, $images, $comboa_root, $tables;

	$sql = 'SELECT *
		FROM ' . THEMES_TABLE . '
		WHERE themes_id = ' . (int) $style;
	if ( !($result = $db->sql_query($sql)) )
	{
		message_die(CRITICAL_ERROR, 'Could not query database for theme info');
	}

	if ( !($row = $db->sql_fetchrow($result)) )
	{
		// We are trying to setup a style which does not exist in the database
		// Try to fallback to the board default (if the user had a custom style)
		// and then any users using this style to the default if it succeeds
		if ( $style != $board_config['default_style'])
		{
			$sql = 'SELECT *
				FROM ' . THEMES_TABLE . '
				WHERE themes_id = ' . (int) $board_config['default_style'];
			if ( !($result = $db->sql_query($sql)) )
			{
				message_die(CRITICAL_ERROR, 'Could not query database for theme info');
			}

			if ( $row = $db->sql_fetchrow($result) )
			{
				$db->sql_freeresult($result);

				$sql = 'UPDATE ' . USERS_TABLE . '
					SET user_style = ' . (int) $board_config['default_style'] . "
					WHERE user_style = $style";
				if ( !($result = $db->sql_query($sql)) )
				{
					message_die(CRITICAL_ERROR, 'Could not update user theme info');
				}
			}
			else
			{
				message_die(CRITICAL_ERROR, "Could not get theme data for themes_id [$style]");
			}
		}
		else
		{
			message_die(CRITICAL_ERROR, "Could not get theme data for themes_id [$style]");
		}
	}

	$template_path = 'templates/' ;
	$template_name = $row['template_name'] ;

	$template = new Template($comboa_root . $template_path . $template_name);

	if ( $template )
	{
		$current_template_path = $template_path . $template_name;
		@include($comboa_root . $template_path . $template_name . '/' . $template_name . '.cfg');

		if ( !defined('TEMPLATE_CONFIG') )
		{
			message_die(CRITICAL_ERROR, "Could not open $template_name template config file", '', __LINE__, __FILE__);
		}

		$img_lang = ( file_exists(@site_realpath($comboa_root . $current_template_path . '/images/lang_' . $board_config['default_lang'])) ) ? $board_config['default_lang'] : 'english';

		while( list($key, $value) = @each($images) )
		{
			if ( !is_array($value) )
			{
				$images[$key] = str_replace('{LANG}', 'lang_' . $img_lang, $value);
			}
		}
	}

	return $row;
}

function encode_ip($dotquad_ip)
{
	$ip_sep = explode('.', $dotquad_ip);
	return sprintf('%02x%02x%02x%02x', $ip_sep[0], $ip_sep[1], $ip_sep[2], $ip_sep[3]);
}

function decode_ip($int_ip)
{
	$hexipbang = explode('.', chunk_split($int_ip, 2, '.'));
	return hexdec($hexipbang[0]). '.' . hexdec($hexipbang[1]) . '.' . hexdec($hexipbang[2]) . '.' . hexdec($hexipbang[3]);
}

//
// Create date/time from format and timezone
//
function create_date($format, $gmepoch, $tz, $smart_dates = false)
{
	global $board_config, $lang, $userdata;
	static $translate;

	if ( empty($translate) && $board_config['default_lang'] != 'english' )
	{
		@reset($lang['datetime']);
		while ( list($match, $replace) = @each($lang['datetime']) )
		{
			$translate[$match] = $replace;
		}
	}

//-- mod : Smart Dates ------------------------------------------------------------
//-- delete
//	return ( !empty($translate) ) ? strtr(@gmdate($format, $gmepoch + (3600 * $tz)), $translate) : @gmdate($format, $gmepoch + (3600 * $tz));
//-- fin mod : Smart Dates --------------------------------------------------------
//-- mod : Smart Dates ------------------------------------------------------------
//-- add
	if ($smart_dates && $board_config['smart_dates_allow'] && $userdata['user_smart_dates'])
	{
		$use_time = false;
		$diff = time() - $gmepoch;
		switch (true)
		{
			case ($diff < 60):
				$secs = (int) gmdate('s', $diff);
				$ret = ($secs == 1) ? $lang['Smart_dates_second'] : sprintf($lang['Smart_dates_seconds'], $secs);
				$ret = sprintf($lang['Smart_dates_ago'], $ret);
			break;
			
			case ($diff < 3600):
				$mins = (int) gmdate('i', $diff);
				$ret = ($mins == 1) ? $lang['Smart_dates_minute'] : sprintf($lang['Smart_dates_minutes'], $mins);
				$ret = sprintf($lang['Smart_dates_ago'], $ret);
			break;
			
			case ($diff < (3600 * 24)):
				$hours = (int) gmdate('G', $diff);
				$ret = ($hours == 1) ? $lang['Smart_dates_hour'] : sprintf($lang['Smart_dates_hours'], $hours);
				$ret = sprintf($lang['Smart_dates_ago'], $ret);
				$use_time = true;
			break;
			
			case ($diff < (3600 * 24) * 2):
				$ret = $lang['Smart_dates_yesterday'];
				$use_time = true;
			break;
			
			case (($diff > (3600 * 24) * 3) && ($diff < (3600 * 24) * 7)):
				$days = gmdate('j', $diff);
				$ret = $days . ' ' . $lang['Days'];
				$ret = sprintf($lang['Smart_dates_ago'], $ret);
				$use_time = true;
			break;
		}
	}
	
	if ($ret)
	{
		if ($board_config['smart_dates_time'] && $use_time)
		{
			$min_sec = gmdate('g:i a', $gmepoch + (3600 * $tz));
			$ret = sprintf($lang['Smart_dates_at'], $ret, $min_sec);
		}
	}
	else
	{
		$ret = (!empty($translate)) ? strtr(@gmdate($format, $gmepoch + (3600 * $tz)), $translate) : @gmdate($format, $gmepoch + (3600 * $tz));
	}
	
	return $ret;
//-- fin mod : Smart Dates --------------------------------------------------------

}

//
// Pagination routine, generates
// page number sequence
//
function generate_pagination($base_url, $num_items, $per_page, $start_item, $add_prevnext_text = TRUE)
{
	global $lang;

	$total_pages = ceil($num_items/$per_page);

	if ( $total_pages == 1 )
	{
		return '';
	}

	$on_page = floor($start_item / $per_page) + 1;

	$page_string = '';
	if ( $total_pages > 10 )
	{
		$init_page_max = ( $total_pages > 3 ) ? 3 : $total_pages;

		for($i = 1; $i < $init_page_max + 1; $i++)
		{
			$page_string .= ( $i == $on_page ) ? '<b>' . $i . '</b>' : '<a href="' . append_sid($base_url . "&amp;start=" . ( ( $i - 1 ) * $per_page ) ) . '">' . $i . '</a>';
			if ( $i <  $init_page_max )
			{
				$page_string .= ", ";
			}
		}

		if ( $total_pages > 3 )
		{
			if ( $on_page > 1  && $on_page < $total_pages )
			{
				$page_string .= ( $on_page > 5 ) ? ' ... ' : ', ';

				$init_page_min = ( $on_page > 4 ) ? $on_page : 5;
				$init_page_max = ( $on_page < $total_pages - 4 ) ? $on_page : $total_pages - 4;

				for($i = $init_page_min - 1; $i < $init_page_max + 2; $i++)
				{
					$page_string .= ($i == $on_page) ? '<b>' . $i . '</b>' : '<a href="' . append_sid($base_url . "&amp;start=" . ( ( $i - 1 ) * $per_page ) ) . '">' . $i . '</a>';
					if ( $i <  $init_page_max + 1 )
					{
						$page_string .= ', ';
					}
				}

				$page_string .= ( $on_page < $total_pages - 4 ) ? ' ... ' : ', ';
			}
			else
			{
				$page_string .= ' ... ';
			}

			for($i = $total_pages - 2; $i < $total_pages + 1; $i++)
			{
				$page_string .= ( $i == $on_page ) ? '<b>' . $i . '</b>'  : '<a href="' . append_sid($base_url . "&amp;start=" . ( ( $i - 1 ) * $per_page ) ) . '">' . $i . '</a>';
				if( $i <  $total_pages )
				{
					$page_string .= ", ";
				}
			}
		}
	}
	else
	{
		for($i = 1; $i < $total_pages + 1; $i++)
		{
			$page_string .= ( $i == $on_page ) ? '<b>' . $i . '</b>' : '<a href="' . append_sid($base_url . "&amp;start=" . ( ( $i - 1 ) * $per_page ) ) . '">' . $i . '</a>';
			if ( $i <  $total_pages )
			{
				$page_string .= ', ';
			}
		}
	}

	if ( $add_prevnext_text )
	{
		if ( $on_page > 1 )
		{
			$page_string = ' <a href="' . append_sid($base_url . "&amp;start=" . ( ( $on_page - 2 ) * $per_page ) ) . '">' . $lang['Previous'] . '</a>&nbsp;&nbsp;' . $page_string;
		}

		if ( $on_page < $total_pages )
		{
			$page_string .= '&nbsp;&nbsp;<a href="' . append_sid($base_url . "&amp;start=" . ( $on_page * $per_page ) ) . '">' . $lang['Next'] . '</a>';
		}

	}

	$page_string = $lang['Goto_page'] . ' ' . $page_string;

	return $page_string;
}

//
// This does exactly what preg_quote() does in PHP 4-ish
// If you just need the 1-parameter preg_quote call, then don't bother using this.
//
function phpbb_preg_quote($str, $delimiter)
{
	$text = preg_quote($str);
	$text = str_replace($delimiter, '\\' . $delimiter, $text);
	
	return $text;
}

//
// Obtain list of naughty words and build preg style replacement arrays for use by the
// calling script, note that the vars are passed as references this just makes it easier
// to return both sets of arrays
//
function obtain_word_list(&$orig_word, &$replacement_word)
{
	global $db;

	//
	// Define censored word matches
	//
	$sql = "SELECT word, replacement
		FROM  " . WORDS_TABLE;
	if( !($result = $db->sql_query($sql)) )
	{
		message_die(GENERAL_ERROR, 'Could not get censored words from database', '', __LINE__, __FILE__, $sql);
	}

	if ( $row = $db->sql_fetchrow($result) )
	{
		do 
		{
			$orig_word[] = '#\b(' . str_replace('\*', '\w*?', preg_quote($row['word'], '#')) . ')\b#i';
			$replacement_word[] = $row['replacement'];
		}
		while ( $row = $db->sql_fetchrow($result) );
	}

	return true;
}

//
// This is general replacement for die(), allows templated
// output in users (or default) language, etc.
//
// $msg_code can be one of these constants:
//
// GENERAL_MESSAGE : Use for any simple text message, eg. results 
// of an operation, authorisation failures, etc.
//
// GENERAL ERROR : Use for any error which occurs _AFTER_ the 
// common.php include and session code, ie. most errors in 
// pages/functions
//
// CRITICAL_MESSAGE : Used when basic config data is available but 
// a session may not exist, eg. banned users
//
// CRITICAL_ERROR : Used when config data cannot be obtained, eg
// no database connection. Should _not_ be used in 99.5% of cases
//
function message_die($msg_code, $msg_text = '', $msg_title = '', $err_line = '', $err_file = '', $sql = '')
{
	global $db, $template, $board_config, $theme, $lang, $comboa_root, $nav_links, $gen_simple_header, $images;
	global $userdata, $user_ip, $session_length;
	global $starttime;

	if(defined('HAS_DIED'))
	{
		die("message_die() was called multiple times. This isn't supposed to happen. Was message_die() used in page_tail.php?");
	}
	
	define('HAS_DIED', 1);
	

	$sql_store = $sql;
	
	//
	// Get SQL error if we are debugging. Do this as soon as possible to prevent 
	// subsequent queries from overwriting the status of sql_error()
	//
	if ( DEBUG && ( $msg_code == GENERAL_ERROR || $msg_code == CRITICAL_ERROR ) )
	{
		$sql_error = $db->sql_error();

		$debug_text = '';

		if ( $sql_error['message'] != '' )
		{
			$debug_text .= '<br /><br />SQL Error : ' . $sql_error['code'] . ' ' . $sql_error['message'];
		}

		if ( $sql_store != '' )
		{
			$debug_text .= "<br /><br />$sql_store";
		}

		if ( $err_line != '' && $err_file != '' )
		{
			$debug_text .= '<br /><br />Line : ' . $err_line . '<br />File : ' . basename($err_file);
		}
	}

	if( empty($userdata) && ( $msg_code == GENERAL_MESSAGE || $msg_code == GENERAL_ERROR ) )
	{
		$userdata = session_pagestart($user_ip, PAGE_INDEX);
		init_userprefs($userdata);
	}

	//
	// If the header hasn't been output then do it
	//
	if ( !defined('HEADER_INC') && $msg_code != CRITICAL_ERROR )
	{
		if ( empty($lang) )
		{
			if ( !empty($board_config['default_lang']) )
			{
				include($comboa_root . 'language/lang_' . $board_config['default_lang'] . '/lang_main.php');
			}
			else
			{
				include($comboa_root . 'language/lang_english/lang_main.php');
			}
		}

		if ( empty($template) || empty($theme) )
		{
			$theme = setup_style($board_config['default_style']);
		}

		//
		// Load the Page Header
		//
		if ( !defined('IN_ADMIN') )
		{
			include($comboa_root . 'includes/page_header.php');
		}
		else
		{
			include($comboa_root . 'admin/page_header_admin.php');
		}
	}

	switch($msg_code)
	{
		case GENERAL_MESSAGE:
			if ( $msg_title == '' )
			{
				$msg_title = $lang['Information'];
			}
			break;

		case CRITICAL_MESSAGE:
			if ( $msg_title == '' )
			{
				$msg_title = $lang['Critical_Information'];
			}
			break;

		case GENERAL_ERROR:
			if ( $msg_text == '' )
			{
				$msg_text = $lang['An_error_occured'];
			}

			if ( $msg_title == '' )
			{
				$msg_title = $lang['General_Error'];
			}
			break;

		case CRITICAL_ERROR:
			//
			// Critical errors mean we cannot rely on _ANY_ DB information being
			// available so we're going to dump out a simple echo'd statement
			//
			include($comboa_root . 'language/lang_english/lang_main.php');

			if ( $msg_text == '' )
			{
				$msg_text = $lang['A_critical_error'];
			}

			if ( $msg_title == '' )
			{
				$msg_title = 'phpBB : <b>' . $lang['Critical_Error'] . '</b>';
			}
			break;
	}

	//
	// Add on DEBUG info if we've enabled debug mode and this is an error. This
	// prevents debug info being output for general messages should DEBUG be
	// set TRUE by accident (preventing confusion for the end user!)
	//
	if ( DEBUG && ( $msg_code == GENERAL_ERROR || $msg_code == CRITICAL_ERROR ) )
	{
		if ( $debug_text != '' )
		{
			$msg_text = $msg_text . '<br /><br /><b><u>DEBUG MODE</u></b>' . $debug_text;
		}
	}

	if ( $msg_code != CRITICAL_ERROR )
	{
		if ( !empty($lang[$msg_text]) )
		{
			$msg_text = $lang[$msg_text];
		}

		if ( !defined('IN_ADMIN') )
		{
			$template->set_filenames(array(
				'message_body' => 'message_body.html')
			);
		}
		else
		{
			$template->set_filenames(array(
				'message_body' => 'admin/admin_message_body.html')
			);
		}

		$template->assign_vars(array(
			'MESSAGE_TITLE' => $msg_title,
			'MESSAGE_TEXT' => $msg_text)
		);
		$template->pparse('message_body');

		if ( !defined('IN_ADMIN') )
		{
			include($comboa_root . 'includes/page_tail.php');
		}
		else
		{
			include($comboa_root . 'admin/page_footer_admin.php');
		}
	}
	else
	{
		echo "<html>\n<body>\n" . $msg_title . "\n<br /><br />\n" . $msg_text . "</body>\n</html>";
	}

	exit;
}

//
// This function is for compatibility with PHP 4.x's realpath()
// function.  In later versions of PHP, it needs to be called
// to do checks with some functions.  Older versions of PHP don't
// seem to need this, so we'll just return the original value.
// dougk_ff7 <October 5, 2002>
function site_realpath($path)
{
	global $comboa_root;

	return (!@function_exists('realpath') || !@realpath($comboa_root . 'includes/functions.php')) ? $path : @realpath($path);
}

function redirect($url)
{
	global $db, $board_config;

	if (!empty($db))
	{
		$db->sql_close();
	}

	if (strstr(urldecode($url), "\n") || strstr(urldecode($url), "\r") || strstr(urldecode($url), ';url'))
	{
		message_die(GENERAL_ERROR, 'Tried to redirect to potentially insecure url.');
	}

	$server_protocol = ($board_config['cookie_secure']) ? 'https://' : 'http://';
	$server_name = preg_replace('#^\/?(.*?)\/?$#', '\1', trim($board_config['server_name']));
	$server_port = ($board_config['server_port'] <> 80) ? ':' . trim($board_config['server_port']) : '';
	$script_name = preg_replace('#^\/?(.*?)\/?$#', '\1', trim($board_config['script_path']));
	$script_name = ($script_name == '') ? $script_name : '/' . $script_name;
	$url = preg_replace('#^\/?(.*?)\/?$#', '/\1', trim($url));

	// Redirect via an HTML form for PITA webservers
	if (@preg_match('/Microsoft|WebSTAR|Xitami/', getenv('SERVER_SOFTWARE')))
	{
		header('Refresh: 0; URL=' . $server_protocol . $server_name . $server_port . $script_name . $url);
		echo '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta http-equiv="refresh" content="0; url=' . $server_protocol . $server_name . $server_port . $script_name . $url . '"><title>Redirect</title></head><body><div align="center">If your browser does not support meta redirection please click <a href="' . $server_protocol . $server_name . $server_port . $script_name . $url . '">HERE</a> to be redirected</div></body></html>';
		exit;
	}

	// Behave as per HTTP/1.1 spec for others
	header('Location: ' . $server_protocol . $server_name . $server_port . $script_name . $url);
	exit;
}

// Functions added by ComBoa

// this function builds an associative array with key names equal to
// the database $table's field names. $ar is the array passed by reference
// If $record is non-zero then the table's first field is assumed to be
// an unique index and the record is read from that
// index and the array filled with the reocrd's data
// Function returns non-zero if successful or zero if requested record
// was not found or array could not be populated

function array_from_table(&$ar, $table, $record = 0) {
global $db;
$record = intval($record);

    $sql = "SELECT * FROM $table LIMIT 1";
    $result = $db->sql_query($sql);
    $numfields = $db->sql_numfields($result);
    $firstfield = $db->sql_fieldname(0, $result);
    if(!$numfields) {
        $ar = array();
        return 0;
        }
    if($record == 0) {
        for($x = 0; $x < $numfields; $x++) {
            $fname[$x] = $db->sql_fieldname($x, $result);
            if($record == 0) {
                $ar[$fname[$x]] = '';
            }
        }
        return -1;
    }
    $sql = "SELECT * FROM $table WHERE $firstfield = $record LIMIT 1";
    $result = $db->sql_query($sql);
    if(!($db->sql_affectedrows($result))) {
        $ar = array();
        return 0;
      } else {
        $ar = $db->sql_fetchrow($result);
    }
    return 1;
}

/**
 * Returns information on the requested group ID
 * 
 * get_group takes a group ID as argument
 * and returns an associative array populated
 * with group info. If $gid is not an existing
 * group, an empty array is returned. The key names
 * correspond to their database column name.    
 * 
 * @category Functions  
 * @param integer $gid ID of group
 * @return array group information for $gid or empty array
 * @since Version alpha
 * @copyright ComBoa and Mike McKeown 2009
 */
 /*
 Pos speed improvement. function should 'remember' queried groups
 on successive calls by extending $ginfo into 2d.
 Check with foreach loop to avoid repeated SQL queries
 */
function get_group($gid) {
    static $ginfo, $beenhere = 0;
    
    $gid = intval($gid);
    if($beenhere)
        if($ginfo['group_id'] == $gid)
            return $ginfo;
    
    if(!$beenhere) {
			if(!array_from_table(&$ginfo, GROUPS_TABLE, $gid)) {
	    	$beenhere = 0;
	    	return $ginfo = array();
	    }
		  else
	      $beenhere = 1;
    }
    return $ginfo;
}

/**
 * Checks for user's membership in specified group
 * 
 * get_user_group takes a group ID and optionally
 * a user ID as argument and returns TRUE if $user
 * is in $group. If $user is not supplied current 
 * user is assumed. If $group = -1 a 2d array 
 * with all groups to which the user belongs is returned
 * in the same format as the 'user_group' table.
 * 
 * @category Functions  
 * @param integer $group ID of group, integer $user ID of user
 * @return mixed 
 * @since Version alpha
 * @copyright ComBoa and Mike McKeown 2009
 */

function get_user_group($group = "err", $user = 0) {
    global $db, $userdata;
    static $result, $thisuser;
    
    if(!(is_numeric($group)) || !(is_numeric($user)))
        message_die(CRITICAL_ERROR, 'get_user_group: missing or bad arg');
        
    if($user == 0)
        $user = $userdata['user_id'];
    if((!isset($result)) || ($user != $thisuser['user_id'])) {
            $result = $db->sql_query("SELECT * FROM ".USER_GROUP_TABLE." WHERE user_id = '$user'
               AND user_pending = '0'");
            if(!$result)
                message_die(GENERAL_ERROR, 'Reading user group table', '', __LINE__, __FILE__, $sql);
            $result = $db->sql_fetchrowset($result);
            if(empty($result))
                message_die(GENERAL_ERROR, 'No user group table entry', '', __LINE__, __FILE__, $sql);
            if($userdata['user_id'] == $user)
                $thisuser = $userdata;
            else $thisuser = get_userdata($user);
            //free
        }
    if($group == -1)
        return $result;
    // check for membership in group or pseudo-group
    if($group == GI_EVERYONE)
        return TRUE;
    if($group == GI_ROBOTS && ($thisuser['user_is_bot']))
        return TRUE;
    if($group == GI_ANONYMOUS && ($thisuser['user_id'] == ANONYMOUS))
        return TRUE;
    if($group == GI_REGISTERED && ($thisuser['session_logged_in']))
        return TRUE;
    if($group == GI_MODERATORS && (($thisuser['user_level'] == MOD) || ($thisuser['user_level'] == ADMIN)))
        return TRUE;

    foreach($result as $value) { //fix this
        if($group == $value['group_id'])
            return TRUE;
    }
    return FALSE;
}

function check_script($kill = 1) {
    global $db, $userdata, $lang, $G_scr_file, $G_scr_parent;

    $fail=0;
    $G_scr_file = basename($_SERVER['PHP_SELF']);

    $sql = "SELECT * FROM ".SCRIPTS_TABLE." WHERE scr_file='$G_scr_file' LIMIT 1";
    // AND mod_parent/name = $G_in_module
    $result = $db->sql_query($sql);
    $row = $db->sql_fetchrow($result);
    if(!$row['scr_id']) {
        $fail=1;
        $message_text = $G_scr_file.": ".$lang['Was_not_found'];
    } else {
        $title = $row['scr_title'];
        $G_scr_parent = $row['scr_parent'];
                
        if(!$row['scr_active']) {
            $fail=2;
            $message_text = $title." ". $lang['Feature_disabled'];
        } elseif(!(get_user_group($row['scr_group']) || $userdata['user_level'] == ADMIN)) {
            $fail=3;
            $message_text = $title.": ".$lang['Restricted_by_group'];
        }
    }
    
    if(!$userdata['session_admin'])
        if($fail && $kill) {
		        $message_text.= "<br><br>".$lang['Go_back'];
		        message_die(GENERAL_MESSAGE,$message_text);
        }
    return $fail;
}
?>